Israel should compensate owners of land seized to construct the barrier and those harmed by the barrier;

all states are under obligation not to recognise the situation and ensure Israel's compliance with international law;

the UN should consider what further action to take.

Reading the judgment, ICJ President Shi Jiuyong of China said the court was not convinced the barrier's construction was the only means to achieve Israel's aim of protecting its people from suicide attacks.

The construction of the wall would be "tantamount to de facto annexation," Mr Shi said.

One of the 15 members of the court, US Judge Thomas Buergenthal, dissented from all the findings.

BBC diplomatic correspondent Jonathan Marcus says the real question is what, if anything, will change now that the barrier has been declared illegal.

Arab governments are likely to seek an emergency session of the UN General Assembly to try to secure a resolution endorsing the court's decision.

But experts caution against any expectation of tough UN action - not least because of the US veto in the Security Council.